水深与水面风力对湖水源热泵系统性能的影响

Effects of water depth and surface wind for lake water heat pump systems

为了研究水深与水面风力对湖水源热泵系统性能的影响,建立了垂向一维湖泊水温模型。根据株洲的典型气象年逐时气象参数,对4,8,5.6 m水深时的全年垂向水温分布进行了逐时模拟。模拟结果表明,由于水面风力的混合作用,水体应达到一定的水深,才会出现温度分层现象。如果株洲的湖水深度不小于5.6 m,夏季可以从底层取到温度较低的水,热泵机组的制冷性能优于带冷却塔的冷水机组;而且,冬季取水温度在4℃以上,能够保证在冬季大部分时间内热泵系统的正常制热运行。文章得出的结论也适用于与株洲气候类似的地区。

A one-dimension vertical lake water temperature model was be built to study the effects of water depth and surface wind for lake water heat pump systems. Hourly simulation was performed according to the hourly typical meteorological year meteorological parameter of Zhuzhou for three cases of water depth： 4 m, 8 m and 5.6 m. Simulation results show that adequate lake depth is nee- essary for the existence of temperature stratification due to the mixing action of surface wind. When the lake depth is no less than 5.6 m, cooling water with lower temperature can be taken from lake bottom in summer, and the lake temperature in winter is above 4℃. Therefore, the perfor- mance of lake water heat pump units in cooling mode is better than that of chillers with cooling towers, and the lake water heat pump units can operate normally in most time of heating season. The conclusion is also applicable to other cities whose weather condition is similar to Zhuzhou.